Overview

The Rubimat 200mm f/3.5 Auto is an M42-mount manual focus lens. Its optical performance is not explicitly praised; focusing challenges are noted, as missing focus by a little is common at 200mm, and camera shake may affect sharpness beyond IBIS correction. Build includes an M/A switch: in A mode, the lens stays wide open until the mount pin is depressed (auto stop-down); M mode gives manual aperture control. The lens suits users comfortable with manual focus and adapting M42 lenses, but may require careful focusing and adapter alignment.